Upstream ios/showcase source code.

ios/showcase/settings/BUILD.gn

Index: ios/showcase/settings/BUILD.gn
diff --git a/ios/showcase/settings/BUILD.gn b/ios/showcase/settings/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..6810351c11cd6154d6b300d50c5421108f216e5e
--- /dev/null
+++ b/ios/showcase/settings/BUILD.gn
@@ -0,0 +1,16 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+source_set("settings") {
+  sources = [
+    "settings_coordinator.h",
+    "settings_coordinator.mm",
+  ]
+  deps = [
+    "//base",
+    "//ios/showcase/common",
+  ]
+  libs = [ "UIKit.framework" ]
+  configs += [ "//build/config/compiler:enable_arc" ]
+}